Thanks for the suggestion Vladyslav, turns out FeynArtsDirectory was set to ./FeynArts-3.7/&#65533; and after I changed it seems to load ok. Is it possible for FC to process the output of FA so that traces are contracted etc? I tried the following:

But all the gamma matrices etc are still uncontracted. Is there something else I should do, or is it not possible to convert the CreateFeynAmp output into the type of analytical expression you can usually get in FC?